Instrument for analysis of electric motors based on slip-poles c

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

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318245, 318490, G01R 2316

Patent

active

055789374

ABSTRACT:
A new instrument for monitoring the condition and speed of an operating electric motor from a remote location. The slip-poles component is derived from a motor current signal. The magnitude of the slip-poles component provides the basis for a motor condition monitor, while the frequency of the slip-poles component provides the basis for a motor speed monitor. The result is a simple-to-understand motor health monitor in an easy-to-use package. Straightforward indications of motor speed, motor running current, motor condition (e.g., rotor bar condition) and synthesized motor sound (audible indication of motor condition) are provided. With the device, a relatively untrained worker can diagnose electric motors in the field without requiring the presence of a trained engineer or technician.

REFERENCES:
patent: 4527101 (1985-07-01), Zavis et al.
patent: 4965513 (1990-10-01), Haynes et al.
patent: 4978909 (1990-12-01), Hendrix et al.

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